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diff --git a/po/remove-potcdate.sin b/po/remove-potcdate.sin
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+# Sed script that remove the POT-Creation-Date line in the header entry
+# from a POT file.
+# The distinction between the first and the following occurrences of the
+# pattern is achieved by looking at the hold space.
+# Test if the hold space is empty.
+# Yes it was empty. First occurrence. Remove the line.
+# The hold space was nonempty. Following occurrences. Do nothing.